256310643676331 has 8 divisors (see below), whose sum is σ = 271388943005040. Its totient is φ = 241232477974528.

The previous prime is 256310643676291. The next prime is 256310643676343. The reversal of 256310643676331 is 133676346013652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256310643676331 - 2¹⁸ = 256310643414187 is a prime.

It is a super-2 number, since 2×256310643676331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256310643676231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29444246 + ... + 37142763.

It is an arithmetic number, because the mean of its divisors is an integer number (33923617875630).

Almost surely, 2^{256310643676331} is an apocalyptic number.

256310643676331 is a deficient number, since it is larger than the sum of its proper divisors (15078299328709).

256310643676331 is a wasteful number, since it uses less digits than its factorization.

256310643676331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66813453.

The product of its (nonzero) digits is 29393280, while the sum is 56.

Adding to 256310643676331 its reverse (133676346013652), we get a palindrome (389986989689983).

The spelling of 256310643676331 in words is "two hundred fifty-six trillion, three hundred ten billion, six hundred forty-three million, six hundred seventy-six thousand, three hundred thirty-one".